I Am a Leaf

One day the tree will shake its branches, And still the most greenish leaf will fall. The leaf may die and there are chances! But why a tree would regret for the small? The colour will change as the time goes, No matter how tall that tree has grown! Can't see the leaf below which was one day so close. Forget it, now the leaf has changed to brown. Brightness and darkness has the same crown, But the crown worn by brightness is seen! The leaf has gone all it's way down! Due to the air, which has shaken branches in between.